162 lines
3.4 KiB
C
162 lines
3.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "imageInput.h"
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#define BUFFER_SIZE 100
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#define FILE_HEADER_STRING "__info2_image_file_format__"
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// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
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// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
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GrayScaleImageSeries *readImages(const char *path)
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{
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FILE* file = fopen(path, "rb");
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if(file == NULL)
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{
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puts("could not open file.");
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return NULL;
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}
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if(!checkFileHeaderString(file))
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{
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puts("wrong File.");
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return NULL;
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}
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unsigned short count = getCount(file);
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if(!count)
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{
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puts("could not read number of images.");
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return NULL;
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}
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unsigned short width = getWidth(file);
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if(!width)
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{
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puts("could not read Width of images.");
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return NULL;
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}
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unsigned short height = getHeight(file);
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if(!height)
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{
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puts("could not read height of images.");
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return NULL;
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}
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GrayScaleImageSeries *series = createSeries(count);
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series->count = count;
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unsigned short resolution = width * height;
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for(unsigned int i = 0; i < series->count; i++)
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{
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series->images[i].width = width;
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series->images[i].height = height;
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series->images[i].buffer = getPixels(file, resolution);
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series->labels[i] = getLabel(file);
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}
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fclose(file);
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return series;
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}
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// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
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void clearSeries(GrayScaleImageSeries *series)
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{
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for(int i = 0; i < series->count; i++)
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{
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free(series->images[i].buffer);
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}
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free(series->images);
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free(series->labels);
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free(series);
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}
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int checkFileHeaderString(FILE *file)
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{
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char buffer[strlen(FILE_HEADER_STRING)];
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fread(buffer, sizeof(char), strlen(FILE_HEADER_STRING), file);
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for(int i = 0; i < strlen(FILE_HEADER_STRING); i++)
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{
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if(buffer[i] != FILE_HEADER_STRING[i])
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{
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return 0;
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}
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}
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return 1;
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}
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unsigned short getCount(FILE *file)
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{
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unsigned short count = 0;
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fread(&count, sizeof(unsigned short), 1, file);
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return count;
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}
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unsigned short getWidth(FILE *file)
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{
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unsigned short width = 0;
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fread(&width, sizeof(unsigned short), 1, file);
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return width;
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}
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unsigned short getHeight(FILE *file)
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{
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unsigned short height = 0;
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fread(&height, sizeof(unsigned short), 1, file);
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return height;
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}
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GrayScaleImageSeries *createSeries(unsigned short count)
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{
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GrayScaleImage *images = (GrayScaleImage*) calloc(count, sizeof(GrayScaleImage));
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unsigned char *labels = (unsigned char*) calloc(count, sizeof(unsigned char));
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GrayScaleImageSeries *series = (GrayScaleImageSeries*) calloc(1, sizeof(GrayScaleImageSeries));
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series->images = images;
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series->labels = labels;
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return series;
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}
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GrayScalePixelType *getPixels(FILE *file, unsigned short resolution)
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{
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GrayScalePixelType *pixels = (GrayScalePixelType*) calloc(resolution, sizeof(GrayScalePixelType));
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fread(pixels, sizeof(GrayScalePixelType), resolution, file);
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return pixels;
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}
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unsigned char getLabel(FILE *file)
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{
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unsigned char label = '\0';
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fread(&label, sizeof(unsigned char), 1, file);
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return label;
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} |